How many days should there be between cycles?

gummybear

New member
So, I've noticed that recently my cycle has had 21 days between each. I normally get two cycles around November and December, but I got two periods in a month in February, so I counted days between then and my March cycle. it was 21. Then it was 21 days until my April cycle. And I got two in May, 21 days apart. Is this normal??
I am counting between last day and first day, three day cycles.
 
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